Car-truck.



No. 706,584.V APaltenm A ug. l2,v |902.

s. c'. MURRAY CAR TRUCK.

(Application led Har. 8, 1902.)

(No Model.) v 2 Shees-Shreet L j2me/2%??? v ,9W j

UNITED STATES i PATENT OFFICE.

GEORGE C. MURRAY, OF CHICAGO,` ILIIINOIS.

CAR-TRUCK.

SPECIFICATION forming part of Letters Patent No. 706,584, dated August 12, 1902.

Application tiled March 8, 1902.

To cir/ZZ whom, t may concern.-

Be it known that I, GEORGE C. MURRAY, a citizen of the United States, residing at Chi cago, in the county of (look and State of Illinois, have invented certain new and useful Improvements in Gar-Trucks, of which the following is a specification.

This invention relates to that class of cartrucks which is used in connection with railway-cars, and particularly to the arrangement and disposition of the swinging seats by which the lurching movements of the ends of the car and the swinging of the bolster from end toV end thereof may be permitted without racking any of the parts, all ofwhich will be more fully hereinafter set forth.

The principal object of the invention is to provide a simple, economical, and efficient car-truck'.

A further object of the invention is to provide a simple, economical, and efficient cartruck with bolster mechanism, bolster or transom columns connected together by the usual arch-bars, with swinging and spring mechanisms by which the ordinary lurching or longitudinal displacement of the parts may be taken care of without displacing the same.

Further objects of the invention will appear from an examination of the drawingsand the following description and claims.

The invention consists principally in a cartruck in whichA there are combined transom or bolster columns connected together and supported at their upper and lower ends by means of and with the usual arch-bars, a bolster movably mounted between the same, a spring-seat rockingly mounted between such bolstencolumns, and springmechanism interposed between the ends of the bolster and the spring-seats.

The invention consists, further, in a cartruck in which there are combined the usual bolster or transom columns connected by and with the usual arch-bars, a bolster movably mounted between the same, a spring-seat, rockinglevers mounted between the transomcolumns and supporting springseat, and spring mechanism interposed between the spring-seat and the ends of the bolster.

The invention consists, further and finally, in the features, combinations, and details serial No. 97,258. nti model.)

of construction hereinafter "described and claimed. f

In the accompanying drawings, Figure l is a side elevation of a car-truck constructed in accordance with these improvements; Fig. 2, a sectional plan View taken through the bolster and its columns on line 2 of Fig. 1, showing a portion thereof and looking at it from above; Fig. 3, a similar View taken on line 3 of Fig. l looking at it from above; Fig. 4, a longitudinal sectional-detail taken on line 4 of Fig. 8; Fig. 5, a similar view taken on line 5 of Fig. il;V Fig. 6, aside elevation of one of the bolster-columns looking at. it from the in* side and showing the toothed platform for the 4 rocking member, and Fig. 7a side elevation of one of the rocking levers.

Intheart to which this invention relates it is well known that a car when taking a curve, particularly when there is little or no iiexure to the body of the car, the bolster in order to accommodate itself to the'diiferent positions assumed by the body of the car, incident to the'lurching thereof is forced fromside to side or endwise of the bolster so as to displace the parts. If no mechanism is provided for the compensation of this lurching or ri-` gidity of the usual members of the car construction, the endwise thrust on thebolster and parts with which it is ,engaged is apt to result in the rapid wear, if not destruction, of some of these parts. The principalv object of this invention, therefore,A is toprovide a truck of suchconstruction and arrangement that the car-bolster lhas a limited` rocking movementand, further,'so constructed as regards the details thereof that there isla tendency for the parts to resume their normal positions whenthe car is ru'nningin its usual or ordinary manner, all of which willmore fully hereinafter appear. .v i

In constructing a truck in accordance with these improvements, one which is provided with the usual supporting car-wheels a and arch-bars Z2 and c, I provide a pair of, transom or bolster-columns d and secure them between and to the arch-bars in the usual manner, all of which will be understood by those skilled in the art. I next provide a car-bolster c, of any desired construction, having vertical iianges f on each side and at or near the end.

IOO

thereof, which form channels between which the bolster-columns are placed. It will be noticed that these channels are slightly wider than the width of the bolster-column, so as to permit a limited amount of end play -for the bolster and so that it may rock endwise and accommodate itself to the movement of the cars.

In order to overcome the objections already noted and support the ends of the bolster in the desired tilting manner and at the same time permit .the rocking thereof, I make a spring-plate g andpreferably provide it with upwardl y-extendin g arms h at each side thereof. Arranged adjacent to and outside of these arms on the spri ng-plate are two rocking levers i, which are preferably formed of the segment of a circle and provided with trunnions j,

which pass through perforations in the arms of the spring-plate. These rocking-lever arms have their curved lower surfaces toothed, as at k, where they rest upon and engage with a toothed platform or rack Z on the inner base of the transom or bolster columns in such a manner that the rocking-lever arms may rock but not slip thereon. The curvature of the periphery of these rocking levers is eccentric to their trunnions-that is, they are struck from a radius greater than the distance between the center of the trunnions and the curved surface-so that when the parts are in their normal position the central part of the rocking surface is in engagement with the platform `of the column; but when there is a longituthe spring-plate and against the under surface of the ends of the bolster, as shown.

The advantages of this construction are that there is an easy spring yielding mechanism provided for the ends of the bolster to permit the dierent wheels to take different vertical positions, and, further, it provides for the compensation or endwise movement of the bolster without any destruction of the parts, while at the same time providing for the automatic return of the parts to their normal position, all of which will be understood and appreciated by those skilled in the art.

1. In a car-truck of the class described, the

combination of transom or bolster columnsv connected by and with the usual arch-bars, a bolster movably mounted between the same, a spring-seat, rocking levers mounted between the transom-columns and supporting the spring-seat, and spring mechanism interposed between the spring-seat and the ends of the bolster, substantiallyas described.

2. In a car-truck of the class described, the combination .of transom or bolster columns provided with a platform inside the base thereof, a bolster movably mounted between such columns, a spring-plate, spring mechanism interposed between the spring-plate and the ends of the bolster, and independent rocking-lever arms mounted on the base at the bottom and inside the bolster-columns and pivotally engaged with the spring-plates, substantially as described.

3. In a car-truck of the class described, the combination of transom or boltser columns provided with a platform inside of the base thereof, a bolster movably mounted between such columns, a spring-plate, spring mechanism interposed between the spring-plate and the ends of the bolster, and rocking-lever arms on the base portions of the bolstercolumns pivotally engaged with the springplates and provided with rocking curved surfaces of greater radius than the distance between the pivots and the curved surfaces, substantially as described.

` 4. In a car-truck of the class described, the combination of a pair of bolster-columns, toothed platforms arranged inside of such columns, a car-bolster movably mounted between such columns, a spring-plate arranged underneath thebolster and between the bolster-colu mns, toothed rocking levers mounted lon the'toothed platforms and pivotally engaged with the spring-plates,and spring mechanism interposed between the spring-plates and the Ylower surfaces of the ends of the bolster, substantially as described.

5. In a car-truck of the class described, the combination of a pair of bolstercolumns, toothed platforms arranged inside of such bolster-columns at or near the base thereof, a car-bolster movably mounted between such transom-columns, spring-plates mounted between such bolster-columns, rocking-lever arms pivotally secured to such spring-plates and provided with curved toothed surfaces resting on the platform of greater radius than the distance between the pivotal points and such toothed surf aces,.and spring mechanism interposed between the spring-plates and the lower surface of the bolster, substantially as described.

6. In a car-truck of the class described, the combination of a pair of bolster-columns, arch-bars connecting the same together at their upper and lower ends, toothed platforms arranged inside of such bolster-columns at their base portion, a bolster movably mounted between such transom-columns and provided with guides forming a channel of greater width than the bolster-columns to permit a limited movement thereof, spring-plates arranged underneath the bolster between the IOO.

IIO

bolster-columns and provided With upwardlytween such pivotal poin ts and the curved surextending side arms, toothed levers pivotally faces, substantially as described.

engaged by means of trunnions with the arms of the spring-plates and provided with curved GEORGE C' MURRAY 5 toothed rocking surfaces engaging the toothed Witnesses: y platforms and formed of curvatures, the radii THOMAS F. SHERDIAN,

of which are greater than the distance be- HARRY IRWIN CROMER. 

